Precipitation detector for rain and snow detection, HD2013.3

Reliable precipitation status is essential for weather stations, traffic systems and outdoor automation that must react quickly to rain or snow. HD2013.3 detects precipitation with a capacitive sensor, using the percentage of dry sensitive surface to indicate whether precipitation is in progress.

The integrated heater keeps the detector dry, evaporates water and helps prevent false signals caused by fog or dew. At low temperatures, it also melts snow, while the ambient temperature sensor allows the instrument to discriminate between rainfall and snowfall. An external circular dome works as a windshield for the sensor, reducing false indications from environmental effects.

Integration is flexible across monitoring and control systems. RS485 supports Modbus-RTU or a proprietary protocol, while model variants provide 0/4…20 mA, 0…10 V or voltage-free contact output. IP68 protection, ASA technopolymer housing and operation from -40…+60 °C make the detector well suited to demanding outdoor installations.

Rain or snow status
Uses ambient temperature to distinguish rainfall from snowfall, default reference 2 °C

System integration
RS485 Modbus-RTU, 0/4…20 mA, 0…10 V or contact outputs by model

False signal control
Heated sensor evaporates water and helps prevent fog or dew indications

Outdoor protection
IP68 housing supports operation from -40…+60 °C and 0…100 %RH

Features

• Capacitive detection
  The sensor detects precipitation from the percentage of dry sensitive surface, with configurable 1% or 0.1% resolution.
• Integrated heating
  Heating can operate manually, always on, always off or automatically, with configurable power in manual mode.
• Automatic calibration
  The detector can perform automatic calibration at regular intervals to compensate for temperature drift, aging and dirt.
• Configurable threshold
  The precipitation threshold, hysteresis, start delay and end delay can be adjusted via protocol settings.
• RS485 communication
  The digital output uses Modbus-RTU or the proprietary protocol, with configurable address and communication parameters.
• Analog outputs
  HD2013.3 provides 0/4…20 mA output, while HD2013.3AV provides 0…10 V or 2…10 V output, with reversible direction.
• Contact output
  HD2013.3 and HD2013.3AV include a voltage-free normally open contact that closes when precipitation is detected.
• Mast installation
  The supplied bracket mounts to Ø 30…50 mm vertical or horizontal masts, with optional bird spikes available.